# L3VPN using BGP protocol **URL:** \ **Category:** BGP\ **Created:** [August 23, 2018, 3:20pm UTC](https://forum.networklessons.com/t/l3vpn-using-bgp-protocol/4711 "2018-08-23T15:20:37Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![jpkayigire](https://cdn-forum.networklessons.com/letter_avatar_proxy/v4/letter/j/ea5d25/32.png) [@jpkayigire](https://forum.networklessons.com/u/jpkayigire)\ **Post date:** [August 23, 2018, 3:20pm UTC](https://forum.networklessons.com/t/l3vpn-using-bgp-protocol/4711/1 "2018-08-23T15:20:38Z")
Hello Team, One of our customers requested me to provision a L3VPN using BGP. To acheive this, we have 2 segment (A-to-B & C-to-D). A and C as ISP \_ B and D as CEs. When i check routes i am receiving, below is the output: ``` BGP table version is 2291, local router ID is 1.0.0.5 Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter, x best-external, a additional-path, c RIB-compressed, Origin codes: i - IGP, e - EGP, ? - incomplete RPKI validation codes: V valid, I invalid, N Not found Network Next Hop Metric LocPrf Weight Path Route Distinguisher: 22690:8 (default for vrf EQUITY-MPLS) **r 172.27.10.0/30 172.27.10.2 0 0 65006 i** Total number of prefixes 1 ``` why am i getting rib-failure??? how can i fix this? what are the issues caused by rib-failure? Thank you for your consideration. JP ---
**Author:** ![ReneMolenaar](https://cdn-forum.networklessons.com/user_avatar/forum.networklessons.com/renemolenaar/32/488_2.png) [@ReneMolenaar](https://forum.networklessons.com/u/ReneMolenaar)\ **Post date:** [September 6, 2018, 1:31pm UTC](https://forum.networklessons.com/t/l3vpn-using-bgp-protocol/4711/2 "2018-09-06T13:31:00Z")
Hello JP, You get a RIB failure when BGP can’t install something in the routing table. Usually this happens when you can’t resolve the next hop or when there is another route with a better (lower) AD already installed in the routing table. Here’s a quick example: ``` R3#show ip bgp BGP table version is 2, local router ID is 192.168.34.3 Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter, x best-external, a additional-path, c RIB-compressed, t secondary path, Origin codes: i - IGP, e - EGP, ? - incomplete RPKI validation codes: V valid, I invalid, N Not found Network Next Hop Metric LocPrf Weight Path * 4.4.4.4/32 192.168.13.1 0 1 2 4 i *> 192.168.34.4 0 0 4 i ``` ``` R3#show ip route bgp Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2 i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2 ia - IS-IS inter area, * - candidate default, U - per-user static route o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP a - application route + - replicated route, % - next hop override, p - overrides from PfR Gateway of last resort is not set 4.0.0.0/32 is subnetted, 1 subnets B 4.4.4.4 [20/0] via 192.168.34.4, 00:01:43 ``` Let’s add a static route for 4.4.4.4/32 so BGP can’t install the route in the routing table anymore: ``` R3(config)#ip route 4.4.4.4 255.255.255.255 192.168.34.5 ``` You now get an error: ``` R3#show ip bgp BGP table version is 3, local router ID is 192.168.34.3 Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter, x best-external, a additional-path, c RIB-compressed, t secondary path, Origin codes: i - IGP, e - EGP, ? - incomplete RPKI validation codes: V valid, I invalid, N Not found Network Next Hop Metric LocPrf Weight Path r 4.4.4.4/32 192.168.13.1 0 1 2 4 i r> 192.168.34.4 0 0 4 i ``` ``` R3#show ip bgp rib-failure Network Next Hop RIB-failure RIB-NH Matches 4.4.4.4/32 192.168.34.4 Higher admin distance n/a ``` Rene ---
**Author:** ![jpkayigire](https://cdn-forum.networklessons.com/letter_avatar_proxy/v4/letter/j/ea5d25/32.png) [@jpkayigire](https://forum.networklessons.com/u/jpkayigire)\ **Post date:** [October 4, 2018, 3:13pm UTC](https://forum.networklessons.com/t/l3vpn-using-bgp-protocol/4711/3 "2018-10-04T15:13:32Z")
Thanks Rene, i managed to resolve the issue with the help of your explanations. thank you